Ch 34: Matter & Atomic Structure

About This Chapter

Gain an improved understanding of matter and atomic structure with the lessons in this chapter. Take a look at states of matter, the periodic table, and electronegativity.

Matter & Atomic Structure - Chapter Summary

Build your knowledge base about matter and atomic structure with these short lessons. Examine information on physical versus chemical changes to matter, and ionic and atomic radii. Other lesson topics include:

  • Physical and chemical properties of matter
  • Combining elements and compounds to create mixtures
  • Definition and examples of an atom
  • Mass number and atomic number
  • Average atomic mass and isotopes
  • Electron configuration
  • Ionization energy

Lessons are short, making it easy to make progress by logging in using your mobile device whenever you have a few minutes to complete a lesson or two. You can make use of our feature that allows you to submit questions directly to an expert.

12 Lessons in Chapter 34: Matter & Atomic Structure
Test your knowledge with a 30-question chapter practice test
Matter: Physical and Chemical Properties

1. Matter: Physical and Chemical Properties

Matter, or material substances, are identified based on their physical and chemical properties. Explore how this process works and learn how chemists use different properties to determine the classification of matter.

States of Matter: Solids, Liquids, Gases & Plasma

2. States of Matter: Solids, Liquids, Gases & Plasma

There are four states of matter: solid, liquid, gas, and plasma. Explore the characteristics of each state of matter and how they relate to and differ from each other.

States of Matter and Chemical Versus Physical Changes to Matter

3. States of Matter and Chemical Versus Physical Changes to Matter

Matter constantly changes. Learn about the three states of matter, which are gas, liquid, and solid, and understand the differences in chemical versus physical changes in matter.

Creating Mixtures by Combining Elements & Compounds

4. Creating Mixtures by Combining Elements & Compounds

Mixtures are created by physically combining elements and compounds. Learn about single vs. multiple phase mixtures, heterogeneous vs. homogeneous mixtures, and the difference between compounds and mixtures.

What is An Atom? - Definition & Examples

5. What is An Atom? - Definition & Examples

Atoms are the base units that compose molecules and chemical elements, made of protons, neutrons, and electrons. Learn how these are combined to create atoms, and explore the concept of elementary particles which cannot be broken into sub-particles.

Atomic Number and Mass Number

6. Atomic Number and Mass Number

An atom is defined as the smallest particle of an element that displays the same properties of that element. Learn about the main components of an atom (protons, neutrons, & electrons), the characteristics of each component, and how to determine the atomic number and the mass number of an atom.

Isotopes and Average Atomic Mass

7. Isotopes and Average Atomic Mass

Isotopes are variations of the same element with differing numbers of neutrons and, subsequently, different atomic masses. Learn how scientists consider isotopes when they calculate average atomic mass.

Electron Configuration: Orbital, Noble-Gas & Electron-Configuration Notation

8. Electron Configuration: Orbital, Noble-Gas & Electron-Configuration Notation

Discover the complex ways that electrons are organized within an atom. Learn two ways to write electron configurations to show how electrons are organized. Then, test your new knowledge with a quiz.

The Periodic Table: Properties of Groups and Periods

9. The Periodic Table: Properties of Groups and Periods

In the late 1800s, Russian chemist Dmitri Mendeleev created the periodic table by organizing elements by their atomic weight in increasing order. Learn about Mendeleev, discover how the elements on the periodic table are organized, and explore the properties of periods and groups.

Atomic and Ionic Radii: Trends Among Groups and Periods of the Periodic Table

10. Atomic and Ionic Radii: Trends Among Groups and Periods of the Periodic Table

The size of an atom is determined by the distance of the valence electrons from the nucleus. Learn about atomic and ionic radii trends among groups on the periodic table, and how to predict the relative size of an atom based on where it is located on the periodic table.

Ionization Energy: Trends Among Groups and Periods of the Periodic Table

11. Ionization Energy: Trends Among Groups and Periods of the Periodic Table

Ionization energy is the amount of energy needed to remove an electron from an atom. On the periodic table, as atoms increase in size, the amount of energy needed to remove an electron decreases. Learn about ionization energy and how to identify ionization trends on the periodic table.

Electronegativity: Trends Among Groups and Periods of the Periodic Table

12. Electronegativity: Trends Among Groups and Periods of the Periodic Table

Electronegativity measures an atom's tendency to attract a bonding pair of electrons. Explore electronegativity and its trends among groups and periods in the periodic table and discover why some elements are more electronegative than others.

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